D

8 RTYg Pm\n

Dab 1 Yi Xmin

where Yg and Yt are the thicknesses of the gas and liquid boundary layers, respectively, and Pmln and Xm]n are given by

kh then (CAi - CA) > (PA — PAi) and the mass transfer is controlled by the liquid boundary layer. Increasing kt increases the overall transfer rate. If ki > kg, the process is controlled by the gas boundary layer, and the overall rate is greatly affected by kg.

For equimolecular counterdiffusion, comparing equation 11 with equation 52, and equation 21 with equation 53 obtains the following.

Bulk gas phase Pa

Boundary layer__}

in gas side

Bulk liquid phase

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